Back water valve for drains



E. G. STOLTZ 1,993,534

BACK WATER VALVE FOR DRAINS H March 5, 1935.

Filed May 7, 1934 9 FIG. I. FIG. 2.

A B FIG. 3. 0 E1 A X VA VA w m Y 8 l "5 I E INVENTOR EDMUND G. 5TOL'rzHTTORNEYS Patented Mar. 5, 1935 nwrap s'mrss e orrics 1,993,534. I BACKWATER VALVE FOR DRAlNS Edmund G. Stoltz, Granite City, Ill.

Application May 7, 1934, Serial No. 724,346

2 Claims. ,(01. 82 51), I

Thisinvention relates'to drains, and hasfor its main object'to provide anovel back water valve of simple design, that is adapted to be usedtoprevent water in a sewer pipe or drain pipe from backing'up andflooding the surface from which said drain pipe leads.

Figure 1 is a vertical sectional view of my'improved back watervalve,showing the valve member in its closed position.

fo Figure 2 is a-similar view, Showing said-valve member in its openposition.

Figure 3 is a'vertical sectional view, illustrating my improved backwater valve embodied in or forming part of a floor drain 'of the typethat comprises a basin imbedded in the floor.

My invention, briefly described, consists of a" when said valve memberis set in its closed position, water that backs up in the drain pipe iseffectively prevented from passing to the surface being drained. Saidvalve member is preferably of substantially inverted cup shape ingeneral form or outline and is arranged in telescopic relation with saidsupporting member, said valve member being provided at its upper endwith a valve element that co-acts with an annular valve seat on thesupporting member. The cylindrical side portion of the valve member hasscrew threads that co-act with screw threads on the supporting member tomove the valve element towards its seat when the valve member is turnedin one direction, and to move said valve element away from its seat whenthe valve member is turned in the opposite direction. The co-actingscrew threads just referred to may be formed on the interior of thesupporting member and on the exterior of the cylindrical side portion ofthe valve member, or vice versa. portion of the valve member are one ormore drain openings arranged so that when said valve member is in itsnormal open position, water on the surface being drained can escapefreely from said surface and pass through said drain openings into thedrain pipe, and when the valve member is moved into its closed position,said drain openings will become inactive.

55 In the form of my invention illustrated in Fig- In the side 7 uresland 2, the reference character A designatesa sleeve-like or tubularsupporting member which is adapted to be positioned in the hell orflanged upper end portion of a sewer pipe or drain pipeB that leads fromthe top face of a 5 floor or other'suriace C that is to be drained, saidsupporting member A being preferably calked or surrounded by packingmaterial 1 that will produce a tight joint between said supportingmember and the bell of the drain pipe. A 19' valve member, designated asan entirety by the reference character D, is adjustably mounted in thesupporting member A for preventing water that backs up in the drain pipeB from flooding the surface C being drained, said valve D being of suchconstruction that when it is set in its normal open position, shown inFigure 2, water that collects'onthe surface C can escape from same intothe drain pipe B, and when said valve is set in its closed position,shown in Figure 1, 20 it positively cuts oif communication between saidsurface C and drain pipe B.

The valve member D preferably consists of a casting of substantiallyinverted cup shape or form whose cylindrical side portion 2 is providedwith external screw threads 3 that mesh with internal screw threadsformed in an annular rib 4 at the upper end of the supporting member A.Said valve member D is provided at its upper end with an annular valveelement 5 that projects laterally beyond the cylindrical portion 2, andthe upper end of the supporting member A is constructed so as to form anannular valve seat 6 that is arranged in opposed relation to the valveelement 5. Usually, the valve element 5 will be provided with a gasket7, so as to produce a water-tight joint between said valve element andits co-acting valve seat 6 when the valve member D is in its closedposition. One or more drain openings 8 are formed in the cylindrical 0portion 2 of the valve member D, so as to permit water to escape fromthe surface C being drained and flow into the drain pipe B when thevalve member D is in its open position. When said valve member is turnedin a direction to move the portion 2 of same downwardly relatively tothe supporting member A, the drain opening or openings 8 become inactiveor inoperative, assuming, of course, that the valve member is moveddownwardly far enough to cause the annular valve element 5 on same toengage. its co-acting seat 6. In order to facilitate turning the valvemember D, the top portion of said member is provided with anon-circular-shaped lug or projection 9 that can be engaged by a wrench.By adjusting the valve member D vertically relatively to the supportingmember A, communication between the drain pipe B and the surface C beingdrained can be established or cut off. Normally, the valve member D isset in such a position that the drain hole or holes 8 in same arecompletely uncovered, but, if desired, said valve member may be set in aposition so that the internally threaded prtion of the supporting memberA partially covers or closes the drain openings 8, this beingadvantageous in instances where it is desired to control the rate ofdischarge of the water from the surface C being drained to the drainpipe B.

In Figure 3 I have illustrated my improved back water valve as beingcombined with or forming part of a floor drain of the type thatcomprises a basin E imbedded in the floor C and provided at its upperend with a removable grille or grating E. The basin E is provided at itslower end with a depending tubular or sleeve-like portion A thatperforms the same function as the supporting member A of the structureshown in Figures 1 and 2, in that it sustains or carries a valve memberD provided I with an externallyscrew-threaded, cylindrical portion 2that is screwed into internal threads formed in the bottom of the basinor in the upper end portion of the depending tubular part A on thebasin. Normally, the valve member D is set or adjusted in the positionshown in broken lines in Figure 3, so that water which enters the basinE can escape from same through the drain holes 8 and enter the drainpipe B that leads from the basin. If it becomes necessary or desirableto cut off communication between the drain pipe B and the basin E, thevalve member D can be moved into its closed position, shown in fulllines in Figure 3, simply by turning said member in a direction to causethe annular valve element thereon to engage its co-acting seat 6.

A back water valve of the construction above described is inexpensive tomanufacture; it is easy to install, and it forms a very efficient meansfor preventing sewer water from backing up and flooding a surface fromwhich a drain pipe leads, for when the valve member D is set in itsclosed position, it constitutes an absolutely tight closure for thedrain pipe that is rugged and strong enough to successfully withstand ahigh back pressure.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent is:

1. A back water valve for drains, comprising a sleeve-like supportingmember adapted to communicate with a drain pipe and provided with anannular valve seat, a manually-operable valve member provided with avalve element that is adapted to be moved into engagement with said seatto prevent back water in the drain pipe from flowing to the surfacebeing drained, and a cylindrical part on said valve member arranged intelescopic relation with said supporting member and connected with sameby screw threads, said cylindrical part having a drain opening whichpermits water to escape to the drain pipe from the surface being drainedwhen said valve member is set in its open position.

2. A back water valve for drains, comprising a sleeve-like supportingmember provided adjacent its upper end with internal screw threads, amanually-operable valve member provided with an externallyscrew-threaded, cylindrical portion screwed into said supporting member,an annular valve element on said valve member that coacts with a seat onsaid supporting member, and a drain opening in the cylindrical portionof said valve member arranged so as to be housed entirely within saidsupporting member when said valve member is set in its closed position.

EDMUND G. STOLTZ.

